Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d2fcc905964293…

MALICIOUS

PDF

64.8 KB Created: 2021-02-24 03:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 34b1eb147d50223450c05d7de9edb391 SHA-1: e160bed91ba69346d3ae0f1f82ebbe4268c46c0c SHA-256: 16d2fcc905964293aede4ad1e7b0238b8df69e1c86b508de2ca877fc57567464
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, including one pointing to 'baarspo.ru' which is likely part of a phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/123?utm_term=baby+girl+names+with+k+2020 PDF link annotation
    • https://jikudirag.weebly.com/uploads/1/3/4/0/134040407/cea13283ace.pdfIn PDF document text
    • https://vilamewu.weebly.com/uploads/1/3/0/7/130775649/nijabadiwikip.pdfIn PDF document text
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/5981989.pdfIn PDF document text
    • http://kugoramex.iblogger.org/blackberry_z30_latest_os.pdfIn PDF document text
    • http://naderuromopuru.22web.org/24249858528.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxajetolalet.epizy.com/18104333208.pdfIn PDF document text
    • http://tonaligu.epizy.com/jupiwul.pdfIn PDF document text
    • http://zotijoxamofos.epizy.com/73536084466.pdfIn PDF document text
    • http://butazajoru.rf.gd/arjuna_arjuna_video_songs.pdfIn PDF document text
    • http://pafovipazatuk.rf.gd/76628591456.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/sajepizilopawigevonafikif.pdfIn PDF document text
    • http://pobifewudej.epizy.com/latulelagomoba.pdfIn PDF document text
    • http://zunizififuve.epizy.com/95973044621.pdfIn PDF document text
    • http://sidegiri.epizy.com/80327146643.pdfIn PDF document text
    • http://vedisupekak.epizy.com/akeelah_and_the_bee_free_video.pdfIn PDF document text
    • http://vefagukolile.epizy.com/94111225443.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/kabewapinuzokesewaja.pdfIn PDF document text
    • http://xasobanezifo.rf.gd/free_winrar_archiver_for_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/fekuzugajefiligoxenolorov.pdfIn PDF document text
    • http://zatunikepozis.epizy.com/arterial_line_waveform_pulse_pressure_variation.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/strongman_weight_training_routines.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00A 5820 bytes
SHA-256: bc1a88a17f854d89390e99cff5dc1f4640faa7661991477095b175cb0a3a886a
font_01_sfnt_off0000d3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D0 10084 bytes
SHA-256: f1eeac4c4e4d4e149edb462699674acd87aa0a474f958604e08e8faca14f6a23

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